Trion-to-exciton upconversion dynamics in monolayer WSe2

Trion-to-exciton upconversion dynamics in monolayer WSe2
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单层 WSe2 中 Trion 到激子的上转换动力学

DOI:
10.1063/5.0012116
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发表时间:
2020-08
影响因子:
4
通讯作者:
Baoli Liu
Baoli Liu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wenze Lan;Jianfang Wang;Ming Xin;Yuan Huang;Changzhi Gu;Baoli Liu

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我们研究了大规模的机械剥离能剂杜松子钨(WSE2)单层,并使用两色超快的泵送型光谱法覆盖了trion trion to-exciton上转换动力学。 ,我们发现一个快速的TRION至EXCITON上转换过程,上转换时间约为2 ps。通过螺旋分辨的拉曼测量值,我们进一步证明了上转换确实是我们样本中的声子介导的过程。
We investigate the trion-to-exciton upconversion dynamics in a large-scale mechanically exfoliated tungsten diselenide (WSe2) monolayer covered by poly(methyl methacrylate) using two-color ultrafast pump-probe spectroscopy. With resonantly pumping the trion and probing the exciton transitions, we find a fast trion-to-exciton upconversion process with the upconversion time about ∼2 ps. Combined with the temperature-dependent transient reflection and helicity-resolved Raman measurements, we further demonstrate that the upconversion is indeed a phonon-mediated process in our sample.
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